Glass working machine



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GLASS WORKING MACHINE Filed oct. 4, 1939 14 sheets-sheet 2 INVENTOAAug.14,1945. E, GRAY 2,382,052

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' the use of electrically .ment of a novel form UNITED STATES PATENTori-ica 2,382,052 g GLASS WORKING MACHINE David E. Gray, Corning, N. Y.,assigner to Corning Glass Works, Corning, N. Y., avcorpontion of NewYork Application October 4, 1939, Serial No. 297,943

Claims.

The present invention relates to a glassworking machine of -the singlemold type which gathers charges of glass from a molten supply body andfabricates them into ware.

One object of the invention is a simple method of gathering charges ofglass and of their fairication into ware.

Another object is fa glass working machine e which is readily adaptablefor lthe fabrication of a wide variety of forms and sizes of blown ware.A further object is a machine for the automatic gathering andfabrication of glass charges into ware in which the speed of operationand the timing of the various functions can, be readily modified duringthe operation of the machine.

The invention embodies among its features a glass working machine of thesingle mold type having a combined gathering, shearing, and blowheadassembly adapted to gather a charge of glass from the surface of amolten supply body, shear the charge therefrom, prepare the charge forintroduction into a finishing mold while conveying the charge thereto,and to eject the nished article from such assembly in the course of itsmovement toward the molten Supply body for a `subsequent charge.

A further feature of the invention is the simplification of mechanicalstructureby resorting to actuated controlling solenoids and a pluralitof electric motors rather than complex mechanical controls and a singlepower source.

A still further feature embodies the employv of timer by means of whichthe/ timing of occurrence of an entire group of functions may bemodiiiedas a whole with respect to other functions, or may beindividually modined with respect to one another to suit best operatingperformance. s,

Other features' of the invention will appear as [the specificationprogresses.

A preferred form of machine. embodying the invention is illustrateddrawings wherein 1 Fig. l is a plan view of the machine;

Fig. 2 is aside elevation of Fig. l

Fig. 2a is a fragmentary view in elevation and partly in sectionillustrating .a part` of a spindle drive mechanism; e

Fig. 2b is an enlarged view. partly in section, of

i a detail of the machine. s f

Figs, 3 and 4 together show an enlarged side elevation partly in sectionof the gatheing head assembly of the machine;

Fig. 3a is a sectional view of aswitch carried vby the head assembly;

Fig. 3b is a perspective view of part of the structure illustrated inFig. 3a;

Fig. 3c illustrates part of the apparatus of Fig. 3 in an alternativeposition;

Fig. 4d is a view, partly in section, of a frag- :nent of the machine.

Figs. 5 and 6 are enlarged end and side elevations of fragments of themachine illustrating the head raising and lowering unit;

Fig. 5a is a view taken on line Sit-5a of Fig. 5;

Fig. 5b is a view similar to 5a, but showing the parts in a positionthey attain while in operation;

Fig. 'I is a plan view of the mold supporting and operating assembly;

Fig. -8 is a side elevational view of the mold supporting and operatingassembly showing fragments of the mold halves mounted thereon;

Fig. 9 is a plan view of the mold support assembly showing molds mountedthereon and the arrangement for cooling the mold halves and parison;

Fig. 9a is a detail of the mold cooling nozzle; u Fig. 9b is afragmentaryv detail showing part of the linkage between the mold coolingnozzle and 5 to that of the head assembly shown in Fig. 2, but

in the accompanying e illustrating a modified form of shear operatingmechanism;

Fig. 13 is a detail of the shear operating mechanism of Fig. 12;

Figs. 14 and 15 are details of the head mechanism; y v

Fig. 16 is a. sectional plan view illustrating the quadrant andassociated Darts;

Fig. 16a is a side elevation partly in section of a fragment of theapparatus disclosed in Fig. 16;

Fig. 17 is a aide elevation of Fig. 16;

Figs. is and 19 are enlarged pian and side views e l -of the swingmechanism;

Figs. 20 and 20w-20k diagrammatically illus- `trate the gathering of acharge and its developof the timing meenetimi'ng mechanism Fig. 24 is aplan view of the timing mechanism o with its cover removed:

a plunger lowering solenoid |18. Although the position of part-s asshown in Figs. 2 and 3 are such that plunger lifting plate 48 is inengagement with posts 80, such posts are not depended upon to hold theplate in such position. The plate is held against being lowered by theaction of gravity by introducing friction to its movement through themedium of an associated adjusting screw 88 (Figs. 2 and 2b). In otherwords, posts 3l merely function to lift 'platen from a down position towhich it has been previously moved by the energization of solenoid |18.I,

The collar 45 at its lower end carries a chuck operating yoke 58 heldthereon by a nut 51, and I has trimnion block supporting pins 48 and 48'cast integral therewith which ilt into blocks 50 carried in the forkedend of a collar supporting L* lever 5| (Fig. 2) the other end of whichis pivotally secured to rocker arm'25 at 52.

The yoke 58 carries lifting rods 88 and 6| which run down alongsidesleeve 2| and are threaded into a chuck raising shell'bearing collar 82(Fig. 4) carrying a chuck operating shell 63 through a ball bearingassembly 64. The shell 63 contains a relatively heavy member 65 havingchuck supports 86 pivoted thereto equipped with chuck jaws 81 and havingfree ends 68 extending into slots 88 of shell 83. The member 85 alsocontains chuck lifting levers 12. Each of these levers has one end 12'extending into a slot 83' in the wall of shell 88 and a forked endv 122straddling a chuck support near its pivot point. 'I'hese levers havelower surfaces 15 which, as will be more fully brought out later,fulcrum on a plate 16 arranged immediately above the gathering cup 40 toslightly raise the chucks into engagement with the under edge surfacesof the cup after the closure of the chuck jaws thereabout With the chuckJaws 81 in their open position the member 85 rests on jaw ends 88 whichin turn rest on the ',bottm 0f the slots 69 in Shell 63. As will be madeclear later, with the jaws 81 in closed position member 65 rests on itslevers 12 which are then supported on plate 18 which is attached K tospindle 85.

time, as the head assembly is` being lowered, a

, bumper 54 (Figs. 2 and 12) secured to bracket 28 88 encounter thelower surfaces of slots 88 of the now stationary shell 88 `after whichthe supportsv vprior to the completion o f the downward move--r ment ofthe cup 4U so that such cup projects downward substantially beyond thebottom of the chuck jaws before its downward movement has beencompleted. The jaws become locked in their open position by a latch 55(Figs. 3 and 3c) carried by bracket |118 and moved under the yoke 68 bya spring 58'as the sleeve'2l approaches its lowermost position withrespect tothe yoke. Dur-- of sleeve 2|, the plunger lifting plate 48encounters posts 38 so that as the downward movement of the sleeve andofthe cup 40 are being completed the plunger is being retracted into thecup. During the raising movement of the head assembly, lever 5| islifted clear of bumper 54 at which time a latch operating screw 58carried -by an arm 5|' depending from lever 5| moves away from a springactuated latch |08 to connect an associated shear operating rack |88 inrelation for operation with a guide4 ||l| carried by the rocker arm 25.

As the gathering head arrives at the gathering station.' rocker arm 25again functions to momentarily lower the sleeve 2| and spindle 35, thistime for the purpose of introducing the gathering cup into a. supplybody ofmolten glass to gather a charge and also to operate the shearmechanism, as will hereinafterappear.

A gather is obtained by suction during the momentary contact of the cupwith the glass in a manner hereinafter described. During the raising ofthe assembly and separation of the charge from'tlie Supply body by theshear |50, latch 55 is tripped in a manner to be described later,thereby allowing the downward movement of the shell 63 with respect tothe gathering cup 48. As shell 88 is lowered with respect to thegathering cup; the chuck jaws 61 are moved toward their closed positionrby the engagement of the bottom of shell 68 with slanting surfaces 10of supports 86. iThe lowering of shell 83 permits member 85 to lower thechuck jaws with respect to cup 40 so that they can close about the cupin the position illustrated in Fig.' 4b. Just before the shell 68 hasreached its limit of downward travel, the surfaces 15 of levers 12encounter plate 18 which serves as a fulcrum` for these levers andeffects a slight lifting movement of the closed chuck jaws intoengagement with the bottom surface of the gath-v ering cup 40,\asillustrated in Fig. 4c.

Shear operating mechanisms Alternative forms of shear operatingmechanisms are illustrated. Each includes a rack guide assembly lill(Figs. Zand 12) pivotally connected at |82 to the rocker arm 25 andcontaining a rack |83. At the time the head assembly arrives at thegathering station rack |03 is llocked in fixed relation to its guideassembly by its latch |Ii6 so that the rack is raised and lowered witharm 25 and transmits rotary motion to a shear driving pinion |88 carriedon the free end of bracket 28. This pinion is adapted to in turn drive arack H8 pivotally connected to a lever 'Ihis lever at its left'` handend is pivoted at H3 (Fig. 2) to bracket 28 and'- at the other end isforked to accommodate a trunnion block ||4 carrying a rack H5.' Theylatter rack operates in a guide ||1 Secured to the sleeve 2| and is inmesh with a pinion ||8. This pinion is integral with a single Atoothratchet disc |20 adapted to drive its suriporting shaft |2| during thedownward movement of rack ||5 through a pawl |22 carried by` an arm |28keyed to such shaft.

In that form of shear operating mechanism illustrated in Figs. 2 and 3the other end of shaft `|2I carries a bevel pinion 24 which is in meshwith a bevelgear |25 keyed to a shear operating shaft 28.v Thearrangement is such that as rack H5 moves down shaft |2| is turned onecomplete ing the latter portion of the downward movement In that form o!shear operating mechanism illustrated in Figs. 12 and 13 the other endof shaft |2| carries a crank |28 equipped with a roller operable in aslot |28 of a. 'bracket iixed to s rack |30 operable in a suitable guideI3 I. This rack is in mesh with a pinion carried upon shear operatingshaft |26. The arrangement is such that one revolution of shaft i2! iseiective to rotate the shear far enough to the glass and to then returnthe shear to its initial position rather than by continuing its rotationin the same direction to such position. Although this form oi? structureis slightly more complicated than that employing bevel gears, it ispreferable ss it is less likely to distort the charge.

In both forms of structure the lower end of the shear operating shaft|26 hw keyed thereto flange I (Figs. 4 and i2) to which is secured shearcam roller operating jaw itl, which on being rotated transmits rotarymotion to a sleeve Ill keyed to a shear carrying elicit i39 through aroller i carried by an arm [4i integral with sleeve III. Sleeve Ill ismovable enciwise oi sliait Ill between a collar i6! pinned to tile shaftand a spring cup |52 also pinned to the shaft. .aum Justlng and lockingnuts |51! are employed to closely restrict the allowable endvvioemovement of sleeve Ill relative to shaft |39. A spring it@ within cup|52 normally holds the :shaft |39 un relative to sleeve III. A secondiarm |42 integral with sleeve Ill .carries a roller which runs in thotrack I 0f a drum cam MI (lilla. ill udjustublt' held in a half cupsupport is (Fig. 2) by can screws 1B and height adjusting .screws |5i4).` The support M is rigidly iuouoteu ou sleeve Il. The contour oitrack No :lo ouch that tutti cient axial movement is imparted to theshear shaft |39 upon rotation thereof to bring the shear blade |50, onthe lower cnc] oi' shalt, from u lil fill

:lo U

position of rest Well above thc bottino ci the culo 1.

Il to s. position slightly bellino the bottoni or shearing face oi thecup until the t' s very slight extent under tbc after which the bladeitil against the shearing face ol. ing thereunder by spring |53, u 1yshear the charges of glass ss the blade passes under tl axial movementof shaft |39 i variably telescopes into the los parent loo ring the irenti simply' ond ol" hollow shaft |26, the telescoping cutis oi thesesbatte' acting as bearings for one another.

It has heretofore been mentioned that the chuck collar latch Il (Figs. 3anu 3c) is trippetl by the shear mechanism to close the chuck jaws. Thistripping action is eflected by a tripping lever Ill pivoted on a boltpassing through bracket |10, and operated immediately following theshearing operation through a lever |58 and a coito necting'link. |89 bya pin itil carried by bevel gear |24 (Fig. 3) or in the alteri'latlvemechanism by a pin carried by a disc lil (Fig. 12) on shalt |2| of theshear driving mechanism.

It is to be noted also that latch trip screw 53 carried by the dependingextension lil' ci arm 5| at this time encounters and moves latch |08clear of the shear operating rack |03 so that on the subsequent loweringand raising cycle of the head assembly to elect a finished article theshear mechanism does not operate.

The plunger ISI; arranged within the gathering cup Il (Fig. 4) andwhich, as previously stated. functions to assist the chuck jaws inholding the plastic glass attached to the gathering cup, slides betweenthe inner wsll ot` cup Il and 15 b lill lill

the outer surface of a retainer 4|. The plunger is held against rotarymovement relative to cup 40 by a screw |56 passing through the Wall ofthe cup into a vertical groove in the plunger and is movable endwisewith respect to cup 4|) by a key |61 attached to the lower end of aplunger rod |68 by a nut |69. Plonger rod |68 runs through the centerand out of the top of spindle 35 and at its top enel (Fig. 3l is securedto the i'iub lill ol the heretofore described plunger loweringmechanism. including the plunger lowering solenoid llt` Whose circuit iscompleted by a switch itili tripped to closed position, as the chuckjaws close about the gathering cup lll, by pin itt protecting :from theclutch collar trunulon pin llt. The contacts oi the .switch |80 arenormally licltl open against spring tension by a pin it (lille. 3b)operating in a com slot in a alloc itt oi the assembly. the disc isrotated bv tlic lowering oi' pin ills the holding open of suoli contactolo transferred to a latch it! until auch piu liao been lowerctl cnouglito trip the latch by' cuoco-cutout with the tail im' thereof, whereuponclosure oi the contacts it permitted.

Volte oost-cot e it i .ling will.

ai connecten to au air supply no tiiil g. ill bt' lucano oi o. ilcxiblctube-209 ootl tlic vaticuuuo valve .is iu a similar :fashion connue 'lto voc'uuiil. supply liuc EW bv a iicxiblc tubo lilly whereas tlicatmosphere vuelvo I" directly connected to atmosphere at IIB iFig. Elvio the boro oi' its stein its, The vacuum supply lino Hilti (Fig. il)is simply connected to a suitable vacuum punto (not chown). The airsupply liuc 2M, however, terminates in a twoivay valve Mii (Figs. lo andlll operable to establish communication between liuc 2M and a pui! airsupply' liuc 2H during ouch time that valve lill is actuated undercontrol oi pull.' control i .caros to be described later and toestablish communicatlon between line 20# and a blo ply line 20B duringthe time the gatherir'l'gr gaz is over the mold at which time valve i"is under control of a blow switch TIS (Fig. 7) actuated as the mold isclosed about the parison. The vacuum valve is mechanically opened by aVlever |51 (Fig. l5) which is pivotally secured to the racket 4|18 bybolt I" and has its Ires end Ill' forked to accomodate a trunnion block2 0 car-l ried by the stem |85 of the vacuum valve. The lever |51 israised, to actuate the vacuum valve to connect the vacuum line 205 (Fig.2) in communication with the gathering cup 48, by a lug 2H (Fig. 15)secured to rack ||5 of the shear driving mechanism and in such positionthereon that the lever |51 is operated near the end of the up stroke ofthis rack, which occurs as the cup 40 is being lowered intothe supplybody of glass. The vacuum valve is thereafter held in the open positionindependently of lug 2|| by latch 2|5 (Figs. 14 and 15) mountedon abracket 2|6 and rotated by a spring 2|1 under an edge of trunnion block2| 8 as it comes up. An arm 2|8 of latch 2|,5 is in the path of movementof a pin A 2|9 in fixed relation with the armature 22| of the atmospherevalve solenoid 222 which, upon energization, opens the atmosphere valve|86 and through the medium of pin 2| 9 trips latch 2|5, allowing thevacuum valve to close. Energizetion of solenoid 222 is under the jointcontrol of a switch 504 of the timing `mechanism I6 (Fig. 24) and aswitch" 23| (Fig. 4a) and is arranged to occur just after the chuck Jawshave closed about the gathering cup 48 and before the plunger solenoid|18 starts lowering the plunger |65. This is accomplished by so settingthe actuating member 232 of switch 23| on rod 6| that I 81, it isprovided with a thumb screw'228 (Fig.

3) having a right and lefthand thread, one end of which enters a plug incommunication with the valve through its hollow stem |812, the other endof which is threaded into stem |81'.

Head elevating and lowering;

The motorized gear reduction unit 3| (Figs. 2, 5, 5a, 5b and 6) forelevating and lowering the head assembly, is fixed to a plate 235 whichis 'secured directly to the top of the turning post 29. A ratchet wheel238 is keyed to the shaft 231 of this unit, which shaft also carries abell crank m med into the r zao' ment with a stop 255 and the lower endinto the path of movement of the long arm of the bell crank, which isnotched to receive the lower end of this latch.

When the solenoid 241 becomes energized, its armature 246 is pulled upand the stop .244 operates to release the pawl 24| which is instantlypulled down against the ratchet wheel by its spring. The-ratchet Wheel,which is constantly rotating, thereafter carries the pa'wl and crankwith it, as illustrated in Fig. 5b. Before the pawl and bell crank havetraveled one revolution, the

,energizing circuit for the solenoid is opened so that its armatureagain allows the stop 244 to move into the path of the pawl which isaccordingly brought to a positive stop upon completion of onerevolution. The bell crank, of course, is prevented from backing upunder thespring action o f the pawl by the swinging of latch 25 into thenotched end of the bell crank arm just before it is stopped byengagement of the pawl with stop 244. Thus it will be understood thateach time the solenoid is energized the bell crank makes one completerevolution and through connecting rod 239 and rocker arm 25 imparts thehereinbefore described elevating and lowering movement to the gatheringhead assembly.

'Mold carrier and actuating assembly The mold equipment ofthe machine(Figs. '7-l1)comprises mold halves l3| 8 and 3 9, mounted on carriers328 and 32| by means of suitable adapter plates 322l (Figs. '1 and 8).These carriers have slides 328' and '32|' secured thereto resting onside rails 323 mounted on a carrier frame 325. Secured to opposite sidesof the slide rails vare baille plates 326 which shield the slide railsfrom water and glass particles. Attached 238 that is free to turn on theshaft. ,The conv necting rod 239 for imparting rocking movement torocker 'arm 25 extends between such ami and the short arm of the bellcrank. On the long arm df the bell crank is mounted a pawl 24|. A spring242 tends to hold this paiwl in engagement with the ratchet wheel, butsuch engagement is normally prevented by a movable stop A244 pi-votallysupported on plate 235 and having an arm 245 coupled to the amature 246of a solenoid 241 by a link 248. A pin 258 carried by the long arm ofthe bell crank limits the movement of the pawl 24| in the disengagingdirection. In order to prevent retrograde movement of the bell crankfollowing the stopping of the rotation thereof on engagement of the pawlarm 24|' with latch stop 244, a latch 25| is provided. This latch ispivotally mounted on a post 252, carried by plate 235, and carries aspring 253 which swings the upper end of this latch into engageracks33|!` and 33| which engage with a pinion gear 332 mounted in suitablebearings (not shown) pressed into the carrier frame325 and a cooperatingcover 333.` Rack 338 is the driving or operating rack and carries on'the underside thereof as plate 335 (Fig. 8) having a depending lpost336 which carries one end of a connecting rod 331 (Figs. 8, 10 and 11)the other end of which is connected to a bell crank 311 of a moldopening and closing assembly generally designated 34|. This assembly, byimparting back and forth movement to rack 338, transmits suchmovementthrough pinion gear 332 to rack 33| in the opposite direction, therebyeiecting opening and closing movements of the two mold halves. Attachedto the outer end of rack 33| is a cross arm 342 carrying adjustablebumper screws, one of which operates the blow control switch |89 and theother of which operates a plunger control switch 2l2, hereinafterreferred to.

The mold opening and closing assembly includes a. drive motor 38 and anassociated gear reduction unit 316. Free to rotate on a shaft of this'unit is the previously referred to bell crank 311.

This .beu crank is provided with a pawl :so (Figs.

10 and 11) which, under the influence of a spring two movable stops 386and 381 arranged 180 apart on a fixed plate 388 mounted on the gearreduction unit, and one of two associated spnng biased latches 389adapted to prevent retrograde movement of the bell crank as wouldotherwise be possibley when the pawl 300 clears the ratchet wheel. Themovable stops 330 and 381 are linked to armatures 33| and 332 (Fig. 11)or solenoids 303 and 394. When a movalble stop, for example, stop 3", isengaged by the arm 330' of the pawl` 330 and' the associated solenoid344 becomes energized, the stop is withdrawn from the path of movementof the pawl permitting it to engage the rotating ratchet wheel 342.'I'he bell crank is accordingly rotated. As 180 rotation is beingcompleted the bell crank slides past the other latch 330 and pawl arm330' engages the other movable stop 301 Awhich disengages the pawl fromthe ratchet wheel. A pin lll (Fig. 10) pressed into the bell crank isengaged by the pawl Just after the pawl clears the ratchet wheel andprevents over-travel of the bell crank. It is substantially at this timethat the associated latch 343 drops back of the bell crank to preventits possible retrograde movement. Thus the bell crank .is made to cometo rest at two definite positions corresponding to the opened und closedpositions of the mold and is held there until solenoid 332 is energizedat the proper moment of the machine cycle.

Ware and mold cooling Ware cooling equipment is provided and comprisestwo air nozzles 343 (Fig. 9) mounted on diagonally opposite comers ofthe mold carrier frame. and clamped in plates 344 that swivel on DOBts340 which are made adjustable in order to take care of dlii'erent sizeware. These air nozzles by action of springs 301 are made to bearagainst guiding plates 343, fastened to each mold half, and areconnected to a suitable air supply line (not shown) by nexible tubing.

The mold halves are cooled by water ejected from a nozzle 341 (Fig. 9a)connected to a pipe 340 communicating with a water line 31| through atiexible hose. The pipe 34| is supported on one arm o! a bell crank 31|,the other arm of which is connected to the turning post 2s by a link :t4(Figs. 2 and 9b) so that after the mold halves are separated and-as theturning post is rotated t o swing the gathering head assembly toward theforehearth, it swings the nozzle between the mold halves. As will bemore fully described later, a valve 314 (Figs. 16 and 17) controls thewater supply to nozzle 341.

Swing mechanism As has been previously explained. the gathering headassembly, after gathering a charge of glass, is conveyed by rotation o!the turning post 2l to a position over the mold assembly andsubsequently returned to the gathering position. These movements arebrought' about by swing mechanism which includes a motorized gearreduction unit 40| (Figs. 1, 18 and 19) secured directly to the carriage(Fig. l). A ratchet wheel 402 iskeyed to a shaft 403 which extendsentirely through the reduction unit. Adjacent the ratchet wheel 402 abell crank 404 is mounted for i'ree rotation on the shaft. An arm oithis bell crank is provided with a crank pin 403 which carries aconnecting rod l (Figs. 1, 2, 18 and 19) the other end o! which connectswith a sector gear 444 (Fig. 1) pivoted to a post 441 mounted on thecarriage |I `and in mesh with a similar gear 40| secured to the lowerend of the turning post 2l. The arrangementis such that for eachone-hal! revolution o4 the bell crank. est 24 mold assembly. When the isrotated through an arc of approximately The bell crank is'driven by theratchet wheel 402 through a pawl 4|0 carried by the bell crank and underthe influence of a spring 4| i. A tripping mechanism for the pawl ismounted on a plate 4|2 secured to the reduction unit. This mechanismincludes a bracket 4|3 (Fig. 19) bolted to the plate and supporting a.swing solenoid 4|4. The armature 4|5 of this solenoid is linked to onearm of a trigger 4I1, the other arm 4|1' of which passes through anaperture in a tie bar 420 extending between two pawl latches 42| and 422mounted on plate 4|2 and located 180 apart. Stops 423 also carried bythis plate are provided to limit the travel oi' the latches. A spring 4|6 extending between the tie bar and plate 4|2 holds the latch 422 ininoperative relation with respect to the paw] 4|0 and latch 42| inoperative relation therewith so long as the solenoid remainsdeenergized. The operating circuit ol the swing solenoid is undercontrol of switch 503 ol the timing mechanism. hereinafter described.'With the swing solenoid #it deenergizeti, the gathering head assemblyis positioned over the solenoid becomes energized its armature 4|5actuates trigger 4|1, thereby withdrawing the latch 42| from engagementwith the pawl and moving latch 422 into the path of movement thereof. Asthe pawl is released, it engages with the ratchet wheel whichimmediately rotates the pawi and bell crank with it for whereupon thepawl strikes the latch 422. This disengages the pawl from the ratchetwheel and stops it and the bell crank with the connecting rod 405 4insuch position that the gathering head assembly has been moved to thegathering station, where it remains until such time that the solenoid4|4 again becomes deenergized. When this occurs the pawl will again beallowed to engage the ratchet wheel and will accordingly be rotated 180to the starting position where the pawl is again disengaged from theratchet wheel and brought to a stop in its initial position with thegathering head assembly at the molding position,

The lower end o! shaft 403 of the motorized gear reduction unit 40|carries a pulley 425 (Fig.

2) for imparting rotary movement to the blowhead spindle 35 during suchtime that the spindle is at the molding station. The drive is effectedthrough a belt 428, a pulley 421 (Fig. 2a) carried by a stub shaft 424having a gear 420 at its upper end engaged by a gear 420, on the lowerend of a shaft 430 carried by the turning post, just as the gatheringhead arrives at the melding station. As will be observed from Fig. 2a,the stub shaft 424 is resiliently mounted to permit it to give way ifnecessaryas gear 428 engages it. A pulley 432 on the upper end of shaft43| imparts rotary movement to the spindle 3l through a. belt 433 andpulley 42. Other equipment closely associated with and operated by theturning post comprises a quadrant assembly (Figs. 16 and 17) thefunctions of which are to actuate thc puf! control switch |38, a plungerlowering control switch 202 and a head elevating control switch 230. Thequadrant also actuates the pull and blow air supply valve 30| asrequired to supply pui! and blow air to the pull' and blow valve at theproper times, and, as will more i'ully be brought out later, opens andcloses y,the supply valve 31s through which cooling iiuid is fed to themold cooling nozzle 381 (Figs. 9 and

